<template>
  <div>
    <el-menu
      default-active="1-4-1"
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
      :collapse="isCollapse"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b"
    >
      <h3>{{ isCollapse ? '后台' : '通用后台管理' }}</h3>

      <el-menu-item
        @click="clickMenu(item)"
        v-for="item in noChildren"
        :key="item.name"
        :index="item.name"
      >
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </el-menu-item>

      <el-submenu v-for="item in hasChildren" :key="item.label" index="1">
        <template slot="title">
          <i :class="`el-icon-${item.icon}`"></i>
          <span slot="title">{{ item.label }}</span>
        </template>
        <el-menu-item-group
          v-for="subitem in item.children"
          :key="subitem.path"
        >
          <el-menu-item @click="clickMenu(subitem)" :index="subitem.path">{{
            subitem.label
          }}</el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </el-menu>
  </div>
</template>
<script>
export default {
  data () {
    return {
      menuData: [
        {
          path: '/',
          name: 'home',
          label: '首页',
          icon: 's-home',
          url: 'Home/Home'
        },
        {
          path: '/mall',
          name: 'mall',
          label: '商品管理',
          icon: 'video-play',
          url: 'Home/Home'
        },
        {
          path: '/user',
          name: 'user',
          label: '用户管理',
          icon: 'video-play',
          url: 'User/User'
        },

        {
          label: '其他',
          icon: 'location',
          children: [
            {
              path: '/page1',
              name: 'page1',
              label: '页面一',
              icon: 'setting',
              url: 'Other/PageOne'
            },
            {
              path: '/page2',
              name: 'page2',
              label: '页面二',
              icon: 'setting',
              url: 'Other/PageTwo'
            }
          ]
        }
      ]
    }
  },
  methods: {
    handleOpen (key, keyPath) {
      console.log(key, keyPath)
    },
    handleClose (key, keyPath) {
      console.log(key, keyPath)
    },
    clickMenu (item) {
      console.log(item)
      //判断当前路由是否等于点击的菜单路由，若不一致则跳转
      if (this.$route.path !== item.path && item.path !== '/') {
        this.$router.push(item.path)
      }
      this.$store.commit('selectMenu', item)
    }
  },
  computed: {
    noChildren () {
      return this.menuData.filter(item => !item.children)
    },
    hasChildren () {
      return this.menuData.filter(item => item.children)
    },
    isCollapse () {
      return this.$store.state.tab.isCollapse
    }
  }
}
</script>
<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  border-right: none;
  height: 100vh;
  h3 {
    color: #fff;
    text-align: center;
    line-height: 48px;
    font-size: 16px;
    font-weight: 500;
  }
}
</style>
